Crabapple: Aphids Categories: Crabapple Crabapple Insects Ornamental trees Ornamentals Last review date: 2026-09-29 06:57 Last edit date: Aphid colony on leaf Photo by: A.L. Antonelli Biology Aphids on crabapples may be green or reddish in color. They typically feed near the tip of growing shoots, sometimes deforming leaves and stunting terminal growth. Fruit may also […]
Crabapple: Apple-and-thorn skeletonizer Categories: Crabapple Crabapple Insects Ornamental trees Ornamentals Last review date: 2026-09-29 06:57 Last edit date: Apple-and-thorn skeletonizer caterpillar feeding on leaf Photo by: A.L. Antonelli Biology The adult of the apple-and-thorn skeletonizer is a small dark-brown moth. It overwinters as a pupa or an adult, with the females laying eggs in the […]
Crabapple: Leafrollers and leaftiers Categories: Crabapple Crabapple Insects Ornamental trees Ornamentals Last review date: 2026-09-29 06:57 Last edit date: Rhododendron leafroller leaf damage Photo by: Unknown Biology Several species of caterpillars will roll and tie leaves of fruit trees. Characteristic signs of feeding include leaves that are webbed, rolled, and tied, often with frass in […]
Crabapple: San Jose scale Categories: Crabapple Crabapple Insects Ornamental trees Ornamentals Last review date: 2026-04-24 11:44 Last edit date: San Jose scale closeup Photo by: K. Grey Biology San Jose scale is an armored (hard) scale found on many deciduous trees and shrubs including (but not limited to) apple, cherry, elm, maple, poplar, and willow. […]
Crabapple: Powdery mildew Categories: Crabapple Crabapple Diseases Ornamental trees Ornamentals Last review date: 2026-08-28 02:15 Last edit date: Powdery mildew on apple leaves Photo by: R.S. Byther Biology Powdery mildew of crabapple is typically seen on the foliage, but may also occur on twigs, blossoms, and fruit. Characteristic patches of white, powdery fungus develop on […]
Crabapple: Scab Categories: Crabapple Crabapple Diseases Ornamental trees Ornamentals Last review date: 2026-08-28 02:15 Last edit date: Apple scab on leaves and young fruit Photo by: R.S. Byther Biology Scab of crabapples is caused by the same fungus which causes scab on apple and hawthorn. The disease infects during wet weather in the spring and […]
Crabapple: Spider mites Categories: Crabapple Crabapple Insects Ornamental trees Ornamentals Last review date: 2026-04-24 12:24 Last edit date: Spider mites under microscope Photo by: L.K. Tanigoshi Biology Spider mites on crabapple vary in color. They may be yellow, green, red or brown. They have eight legs and are very small, appearing as moving dots when […]
Crabapple: Stem rot Categories: Crabapple Crabapple Diseases Ornamental trees Ornamentals Last review date: 2026-04-24 12:30 Last edit date: Crabapple stem rot: rotten stem has a dark blotch Photo by: R.P. Regan Biology Stem rot of crabapple is caused by a soil-borne fungus. This disease is most prevalent in the winter on nursery stock. The fungus […]